Is there any benefit to getting more than 1000 - or are the extra useless and you stop at the 1000?

Multiple Breen ships.

Keep them. The devs might come up with something to use them for. Having more than one Breen ship is pointless.

A good question. I've been wondering that myself.

I'll make the 25 days easily, I've not missed one yet, but I did have some spare Lobi Crystals lying around, and as I don't buy anything else from the Lobi Store, I used them to buy some more Pictures. The Lobi Boxes usually give out between 4 and 6 Pictures I think. So yeah, people doing these are bound to have extras.

Why would you want more than one Breen ship when it's bound to a single character?

I'd hope so. If not, the least we should be able to do is trade them in for Zen/Lobi/Dilithium or something.

The problem is though, save waiting a whole year, what else are they going to do with Christmas pictures of Q?

Because you can?

turn the rest in for GPL I think

Can Brandon confirm this? Or provide any other info?

May as well keep 'em. They may be usable for the same purpose, with a new ship, next year.

Or not, but if you got them for free, you'll have lost nothing.